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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Various devices for engine priming and enriching the fuel-air mixture.

Identifier  ExFiles\Box 31\3\  Scan033
Date  24th February 1915
  
To BJ from R.{Sir Henry Royce}

2.

R5/IB24215.

the petrol to squirt a long way from the car.

We have another device which avoids this back pressure valve, which has not yet been fully tested and proved, and after we have decided which device we shall adopt, it will require some little time of the engine drafting department making satisfactory designs of the parts. These are things that we ought not to enter upon very lightly, with any temporary tackle.

We have for priming -

(1) The syringe, slightly inconvenient, but unmistakable and simple.

(2) Mr Hives' device of pumping air and petrol into the induction pipe. This is attached to the float feed and has the back pressure valve. It has worked well but is in a temporary state.

(3) Elliott-Royce device which is separate from the float feed chamber and contains no back pressure valve. It is still being experimented with.

For enriching the mixture -

(1) Small cock over the suction chamber, as used on Alpine and 1908 trials.

(2) Lifting of the low speed jet needle.

(3) Quicker regulation of the low speed jet by steering column lever.

It is necessary to have both a priming and an
  
  


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